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The ebay ones of 99p are just instructions to use your main PC (assuming it's got wifi) as a bridge for for xbox.
i.e connect the network socket to a spare network socket on the PC, run the right setup and leave PC on :?
My personal fave is to get a buffalo Airstation for £25 from ebuyer, flash it with DD-WRT and use it as a bridge for anything that's got a ethernet port near your TV.

This is the way i get XBOX LIVE from my wireless router.(Note! My wireless router is in another room)

1. Plug your Ethernet cable into your PC's Ethernet slot and it will appear as a computer symbol in network connections.
2. Go to Network Connections, highlight the computer symbol for the newly attached 360.
3. Highlight your existing internet connection so you have both highlighted.
4. Right click and select "Bridge"